Function joinAlignedDiffsExpand

packages/jest-diff/src/joinAlignedDiffs.ts:289–309

(
  diffs: Array<Diff>,
  options: DiffOptionsNormalized,
)

// Given array of aligned strings with inverse highlight formatting,
// return joined lines with diff formatting.
export const joinAlignedDiffsExpand = (
  diffs: Array<Diff>,
  options: DiffOptionsNormalized,
): string =>
  diffs
    .map((diff: Diff, i: number, diffs: Array<Diff>): string => {
      const line = diff[1];
      const isFirstOrLast = i === 0 || i === diffs.length - 1;

      switch (diff[0]) {
        case DIFF_DELETE:
          return printDeleteLine(line, isFirstOrLast, options);

        case DIFF_INSERT:
          return printInsertLine(line, isFirstOrLast, options);

        default:
          return printCommonLine(line, isFirstOrLast, options);
      }
    })
    .join('\n');